PIN Device Electric Field Isolating Portion Sidewall Damage
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Solution Overview
Problem
The manufacturing process of PIN devices often causes damage to the sidewall, leading to an increase in dark current, which reduces the switching ratio and performance of the device.
Innovation Solution
A PIN device structure is developed with a second doped layer that includes a body portion and an electric field isolating portion, where the electric field isolating portion is doped differently from the body portion and partially encloses it to isolate sidewall electric fields, thereby reducing dark current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the manufacturing process is performed conventionally, then the device can be manufactured, but the sidewall is damaged and dark current increases
Solution Approach 1:
The patent applies preliminary anti-action by introducing an electric field isolating portion before the harmful effect of sidewall damage can manifest. This isolating portion is doped differently from the body portion to create an electric field that counteracts and isolates the harmful electric fields generated by sidewall damage during manufacturing, thereby preventing dark current increase despite inevitable sidewall damage.
Solution Approach 2:
The electric field isolating portion acts as an intermediary element between the body portion and the damaged sidewall. By being doped differently, it creates an intermediate electric field region that mediates and isolates the harmful electric fields from reaching the active regions, thus protecting against dark current generation caused by sidewall damage.
2Reliability
If the electric field isolating portion is added to enclose the body portion, then dark current is reduced, but device structure becomes more complex
Solution Approach 1:
The second doped layer is segmented into functionally distinct regions: the body portion and the electric field isolating portion. This segmentation allows each region to perform its specific function - the body portion for primary device operation and the isolating portion for electric field management - thereby achieving improved switching ratio through targeted structural modification rather than complete redesign.
Solution Approach 2:
The patent applies local quality by doping only specific portions (the electric field isolating portion) differently from the body portion. This localized doping approach creates the necessary electric field isolation precisely where needed at the boundaries, improving switching ratio without requiring uniform changes throughout the entire device structure, thus limiting the increase in complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design significantly reduces dark current by at least an order of magnitude, improving the switching ratio and overall performance of the PIN device.
Implementation Method 1
the electric field isolating portion at least partially enclosing the body portion; and the electric field isolating portion is doped differently from the body portion
Data Source
AI summary
A PIN device includes: a first doped layer, a second doped layer, and an intrinsic layer between the first doped layer and the second doped layer, where the second doped layer includes a body portion and an electric field isolating portion at least partially enclosing the body portion; and the electric field isolating portion is doped differently from the body portion.